U.S. military forces directed a counter-terrorism operation against the al-Shabaab network of Islamic extremists in Somalia, the Pentagon said Monday.
There was no immediate word on whether the operation was successful.
Defense Department press secretary Rear Adm. John Kirby disclosed the action in a brief statement Monday evening.
"U.S. military forces conducted an operation in Somalia today against the al-Shabaab network. We are assessing the results of the operation and will provide additional information as and when appropriate,'' he said.
No other details were released.
The action comes after Somalia's government forces regained control of a high security prison in the capital that was attacked Sunday by heavily armed, suspected Islamic militants who attempted to free other extremists held there.
Kirby did not say whether the U.S. action was related to the prison attack.
The Godka Jilacow prison is an interrogation center for Somalia's intelligence agency, and suspected militants are believed to be held there.
The Washington Post reported that journalists in Somalia said suspected U.S. drones fired missiles near the port city of Barawe, a stronghold for al-Shabab.
It was al-Shabab gunmen who attacked the upscale Westgate Mall in Nairobi, Kenya, last year, killing at least 67 people.
Contributing: Associated Press